I say make a shadowknight. They are a very fun class to play, and make great tanks. The only thing you wont be doing is playing main tank in a raid.
If you make a warrior, you really need proc weapons to hold aggro. If this is your fist character, you probably won't be able to afford any for quite awhile. You can get by as a SK for quite some time on just stuff you find on merchants. Not to mention you can also solo a bit as a SK.
If you want any tips or anything for starting out (especially as a SK) shoot me a pm
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